General: |
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Name: Tellurium
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Symbol: Te
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Group: Non-Metal, Chalcogen
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Atomic weight: 127.60
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Density @ 293 K: 6.24 g/cm3
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Atomic volume: 20.5 cm3/mol
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Group: Non-Metal, Chalcogen
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discovered: 1783
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States: |
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state (s, l, g): s
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melting point: 722.7 K
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boiling point: 1263 K
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Heat of fusion: 17.490 kJ/mol
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Heat of vaporization: 52.550 kJ/mol
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Energies: |
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1st ionization energy: 869.2 kJ/mole
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electronegativity: 2.1
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2nd ionization energy: 1794.6 kJ/mole
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electron affinity: 190.16 kJ/mole
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3rd ionization energy: 2697.7 kJ/mole
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Specific heat: 0.20 J/gK
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heat atomization: 197 kJ/mole atoms
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Oxidation & Electrons: |
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Shells: 2,8,18,18,6
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electron configuration: [Kr] 4d10 5s2 5p4
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minimum oxidation number: -2
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maximum oxidation number: 6
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min. common oxidation no.: 0
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max. common oxidation no.: 6
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Appearance & Characteristics: |
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structure: parallel chains
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color: silvery
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uses: semiconductors, steel
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toxicity: yes
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hardness: 2.3 mohs
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characteristics: semimetal
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Reactions: |
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reaction with air: mild, w/ht, =>TeO2
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reaction with 6M HCl: none
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reaction with 6M HCl: none
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reaction with 15M HNO3: mild, =>Te(IV)
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reaction with 6M NaOH:
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Other Forms: |
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number of isotopes: 8
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hydride(s): H2Te
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oxide(s): TeO2 TeO3
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chloride(s): Te2Cl Te3Cl2 Te4Cl16
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Radius: |
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ionic radius (2- ion): 207 pm
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ionic radius (1- ion): pm
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atomic radius: 142 pm
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ionic radius (1+ ion): pm
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ionic radius (2+ ion): pm
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ionic radius (3+ ion): pm
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Conductivity: |
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thermal conductivity: 11.54 J/m-sec-deg
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electrical conductivity: 0 1/mohm-cm
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polarizability: 5.5 A^3
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Abundance: |
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source: Zn/Pb smelting by-product
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rel. abund. solar system: 0.682 log
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abundance earth's crust: -3 log
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cost, pure: 24 $/100g
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cost, bulk: $/100g
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